What is body tube?

Body tube is a hollow tube through which light travels from the objective to the ocular and it contains a prism at the base of the tube that bends the light rays.

Why there is no nucleus present in mature sieve cell?

Food that is prepared in the leaves of a plant is transported through the sieve pores of the sieve plates placed between the adjacent sieve tubes and reaches the different parts of the plant. The large nucleus of companion cells regulates the function of the sieve tube. This is why mature sieve cells contain a … Read more